Dicarbonyl(η⁵-cyclopentadienyl)(pyrrolyl-N)iron(II)

The crystal structure of the title compound, [Fe(C₅H₅)(C₄H₄N)(CO)₂], shows a discrete molecular structure with a distorted tetrahedral geometry about the Fe atom. The bond angles between the ligands in the tripod and the Fe—Cp_centroid vector range from 121.9 to 123.7 (3)°, and the angles between the tripod ligands range from 90.5 (4) to 96.0 (4)°. The mean Fe—C_carbonyl and Fe—C_Cp distances are 1.776 (4) and 2.098 (16) Å, respectively, [Fe—Cp_centroid 1.722 (4) Å] and the Fe—N_pyrrole distance is 1.962 (3) Å. The Cp and pyrrole rings are both planar (maximum deviations of 0.007 and 0.006 Å, respectively). The rotational orientation of the Cp ring with respect to the tripod ligands is approximately eclipsed with respect to the Fe—N_pyrrole bond [N(1)—Fe(1)—Cp_centroid—C(8) −3.1°]. The dihedral angle between the pyrrole ring and the N(1)—Fe(1)—Cp_centroid plane is 73.7°.

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